Best Triathlon Gels by Race Distance (2026)
Last updated 2026-04-16 · Reviewed by Bryan Collins
The right gel depends on your race distance, your gut, and where you are in the race. Sprint athletes need almost nothing. Ironman racers need 90–120 g carbs/hour, which means stacking gels with drink mix and chews. These are the gels we recommend for each distance band.
Who this list is for
- • Age-group triathletes racing anything from Olympic to Ironman.
- • Athletes building up carbs-per-hour intake in training.
- • First-timers choosing a single gel brand to start with.
Who it is not for
- • Athletes with fructose malabsorption — stick to glucose-only options and consult a sports dietitian.
- • Anyone who has not yet tested gels at race pace — do not debut a new brand on race day.
What to look for
- Carbs per serving — most gels are 22–30 g
- Carb source — multiple-transportable carbs (glucose + fructose) absorb better at high doses
- Caffeine — useful late in the run, risky on the bike for some athletes
- Texture — thick gels need water, isotonic gels do not
At a glance
| Product | Best for | Link |
|---|---|---|
| GU Energy Gels (24-pack) | The default workhorse — sprint to Ironman | Check price |
| GU Roctane (caffeine) | The run leg — caffeine when you need it | Check price |
| Maurten Gel 100 | 70.3 and Ironman athletes pushing 90+ g carbs/hour | Check price |
| Spring Energy gels | Athletes who hate sweet sticky gels | Check price |
| UnTapped maple gels | A natural-source alternative for long Ironman fuelling | Check price |
1. GU Energy Gels (24-pack)
Best for: The default workhorse — sprint to Ironman
~22 g carbs per gel, mild flavour, easy to pocket. Most triathletes have used these and know how their gut responds.
Pros
- + Cheap per serving in 24-pack
- + Familiar — low GI risk
- + Multiple flavours
Cons
- − Need water to wash down
- − Not isotonic
2. GU Roctane (caffeine)
Best for: The run leg — caffeine when you need it
~22 g carbs plus 35 mg caffeine and amino acids. Save these for the second half of the race when fatigue kicks in.
Pros
- + Caffeine boost on the run
- + Same texture as standard GU
Cons
- − More expensive than standard GU
- − Caffeine on the bike upsets some stomachs
3. Maurten Gel 100
Best for: 70.3 and Ironman athletes pushing 90+ g carbs/hour
25 g carbs in a hydrogel format that wraps the carbs in a stable gel — the science suggests easier absorption at high doses. Used by Kipchoge and most pro triathletes.
Pros
- + Excellent GI tolerance at high carb doses
- + Isotonic — no water needed
Cons
- − Expensive per serving
- − Texture takes getting used to
4. Spring Energy gels
Best for: Athletes who hate sweet sticky gels
Real-food-based gels. Lower carb per serving (~18–20 g) but much easier to keep down for athletes who can't stomach standard gels.
Pros
- + Real-food taste
- + Easy on sensitive stomachs
Cons
- − Lower carb dose per gel — need more per hour
- − Higher cost per gram of carbs
5. UnTapped maple gels
Best for: A natural-source alternative for long Ironman fuelling
Pure maple syrup in a sachet. Glucose-only, simple ingredients, popular with athletes doing 8+ hour days.
Pros
- + Single ingredient
- + No artificial anything
Cons
- − Glucose-only — caps absorption around 60 g/hour on its own
- − Best paired with fructose-source carbs
Our picks by use case
Reliable, cheap per serving, well-tolerated by most athletes.
Hydrogel format makes 90+ g/hr sustainable on long races.
Caffeine and amino acids when fatigue kicks in — save for mile 8 onward.
Non-sweet alternative for athletes who struggle with standard gels.
Use these calculators to pick the right product
Frequently asked questions
How many gels should I take per hour?
Sprint: 1 total. Olympic: 2–3 across the bike and run. 70.3: 3–4 per hour mixed with drink mix. Ironman: 4+ per hour as part of a 90–120 g/hour carb plan.
When should I switch to caffeine gels?
Most athletes save caffeine for the run leg. Caffeine on the bike can cause GI issues when combined with high carb intake, so test in training first.
Are Maurten gels worth the price?
For 70.3 and Ironman athletes pushing high carb intakes, often yes — the hydrogel format makes 90+ g/hour easier to tolerate. For sprint and Olympic, standard GU is fine.
Can I mix gel brands?
Yes, but test in training. Different gels have different carb sources, sweeteners and acid levels, which can stack up and cause GI distress on race day.
How we chose these picks
We chose gels covering the full carb-intake range — from sprint (one gel total) to Ironman (90+ g/hour). Picks reflect what age-group and pro athletes actually use, not what is marketed hardest. Amazon affiliate links throughout.